Halloysite from selected localities.
USA | |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 266; Schwartz, G.M. (1947), Hydrothermal alteration in the 'porphyry copper' deposits, Econ.Geol.: 42: 319-352; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 108. |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 257; Schwartz, G.M. (1947), Hydrothermal alteration in the 'porphyry copper' deposits, Econ.Geol.: 42: 319-352. |